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Improperly Posed Problems in Partial Differential EquationsImproperly Posed Problems in Partial Differential Equations

L. E. Payne

CBMS-NSF Regional Conference Series in Applied Mathematics 22

Improperly posed Cauchy problems are the primary topics in this discussion which assumes that the geometry and coefficients of the equations are known precisely. Appropriate references are made to other classes of improperly posed problems. The contents include straight forward examples of methods eigenfunction, quasireversibility, logarithmic convexity, Lagrange identity, and weighted energy used in treating improperly posed Cauchy problems. The Cauchy problem for a class of second order operator equations is examined as is the question of determining explicit stability inequalities for solving the Cauchy problem for elliptic equations. Among other things, an example with improperly posed perturbed and unperturbed problems is discussed and concavity methods are used to investigate finite escape time for classes of operator equations.


Introduction; Methods and examples; Second order operator equations; Remarks on continuous dependence on boundary data, coefficients, geometry, and values of the operator; The Cauchy problem for elliptic equations; Singular perturbations in improperly posed problems; Nonexistence and growth of solutions of Schrodinger-type equations; Finite escape time: concavity methods; Finite escape time: other methods; Miscellaneous results.

1975 / v + 76 / Softcover / ISBN-13: 978-0-898710-19-9 / ISBN-10: 0-89871-019-7 /
List Price $41.00 / SIAM/CBMS Member Price $28.70 / Order Code CB22
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